Clinic OS

Q: A 16-year-old female presents with recurrent lateral patellar dislocations. MRI evaluation of the knee demonstrates a tibial tubercle-trochlear groove (TT-TG) distance of 24 mm. In addition to a media

Correct Answer: Lateral retinacular release. Explanation: A TT-TG distance > 20 mm is considered pathologic and a significant risk factor for patellar instability. An MPFL reconstruction alone in the setting of a highly elevated TT-TG has a high risk of failure. A tibial tubercle osteotomy (medialization) is indicated to correct the lateralized extensor me

Q: A 22-year-old male sustains an acute knee dislocation resulting in disruption of the ACL, PCL, and the posterolateral corner (Schenck KD III-L). Which of the following physical exam findings must be c

Correct Answer: Inability to actively extend the hallux. Explanation: A KD III-L injury (ACL, PCL, and lateral/PLC disruption) has a high association with common peroneal nerve injury (up to 40% in posterolateral corner injuries). The common peroneal nerve innervates the anterior compartment (deep peroneal), which is responsible for ankle dorsiflexion and great toe ex

Q: A 24-year-old male sustains an isolated posterior cruciate ligament (PCL) tibial avulsion fracture. Surgical fixation is planned via an open posteromedial approach (Burks and Schaffer). Which interner

Correct Answer: Between the medial head of the gastrocnemius and the semimembranosus. Explanation: The classic posteromedial approach to the knee, as described by Burks and Schaffer, utilizes the interval between the medial head of the gastrocnemius and the semimembranosus. This provides excellent exposure to the posteromedial corner and the tibial attachment of the PCL while protecting the neuro

Q: During a medial patellofemoral ligament (MPFL) reconstruction for recurrent patellar instability, accurate placement of the femoral tunnel is critical to ensure proper graft isometry. According to Sch

Correct Answer: Anterior to the posterior cortex line and distal to Blumensaat's line. Explanation: Schottle described a radiographic landmark for the femoral origin of the MPFL on a true lateral radiograph: 1 mm anterior to the posterior cortex extension line, 2.5 mm distal to the posterior origin of the medial femoral condyle, and proximal to the level of the posterior aspect of Blumensaat's lin

Q: A 52-year-old male undergoes MRI of the knee after a deep squatting injury, which reveals a complete posterior medial meniscal root tear. Biomechanical studies have demonstrated that a complete tear o

Correct Answer: A total medial meniscectomy. Explanation: A complete tear of the posterior root of the medial meniscus results in an inability of the meniscus to convert axial loads into hoop stresses. The meniscus essentially extrudes, leading to a profound increase in contact pressures equivalent to a total medial meniscectomy.

Q: The posterior cruciate ligament (PCL) provides primary restraint against posterior tibial translation. It is composed of two main functional bundles. During knee range of motion, how do the tension pa

Correct Answer: The anterolateral bundle is tightest in full extension, and the posteromedial bundle is tightest in deep flexion. Explanation: The PCL consists of the larger anterolateral (AL) bundle and the smaller posteromedial (PM) bundle. Biomechanically, the AL bundle is tightest in knee flexion, whereas the PM bundle is tightest in knee extension.

Q: A 28-year-old male sustains a knee injury during a soccer match. On physical examination, the dial test reveals 15 degrees of increased external rotation on the injured side compared to the normal sid

Correct Answer: Isolated posterolateral corner (PLC) injury. Explanation: A positive dial test at 30 degrees of flexion with symmetry at 90 degrees of flexion indicates an isolated posterolateral corner (PLC) injury. If asymmetry is present at both 30 and 90 degrees, it indicates a combined PCL and PLC injury.

Q: A 22-year-old female undergoes a medial patellofemoral ligament (MPFL) reconstruction for recurrent patellar instability. Postoperatively, she complains of a severe loss of knee flexion, and examinati

Correct Answer: Placement too proximal. Explanation: The isometric point for the MPFL femoral origin (Schöttle's point) is strictly defined. Placement of the femoral tunnel too proximal results in a graft that becomes excessively tight in knee flexion, leading to a flexion deficit and increased medial patellofemoral cartilage pressures.

Q: A 12-year-old gymnast complains of poorly localized knee pain. Radiographs demonstrate a well-circumscribed osteochondral defect with a stable subchondral bone fragment. In juvenile osteochondritis di

Correct Answer: Lateral aspect of the medial femoral condyle. Explanation: The classic and most common location for osteochondritis dissecans (OCD) in the knee is the lateral aspect of the medial femoral condyle. Initial management for a stable lesion in a patient with open physes is typically non-operative.

Q: A 22-year-old female presents with recurrent patellar instability. You plan a medial patellofemoral ligament (MPFL) reconstruction. Intraoperatively, fluoroscopy is used to determine the exact femoral

Correct Answer: 1 mm anterior to the posterior cortical line, 2.5 mm distal to the posterior articular border of the medial femoral condyle, and proximal to Blumensaat's line.. Explanation: Schöttle's point is a reliable fluoroscopic landmark for anatomical MPFL femoral tunnel placement. It is located 1 mm anterior to the posterior cortical line extension, 2.5 mm distal to the posterior articular border of the medial femoral condyle, and proximal to the intersection of Blumensaat's lin

Question 701

Topic: Knee Sports

A 16-year-old female presents with recurrent lateral patellar dislocations. MRI evaluation of the knee demonstrates a tibial tubercle-trochlear groove (TT-TG) distance of 24 mm. In addition to a medial patellofemoral ligament (MPFL) reconstruction, which of the following procedures is most indicated to correct her underlying pathoanatomy?

. Lateral retinacular release

. Trochleoplasty

. Distal femoral varus osteotomy

. Tibial tubercle medialization osteotomy

. Proximal tibial valgus osteotomy

Correct Answer & Explanation

. Lateral retinacular release

Explanation

A TT-TG distance > 20 mm is considered pathologic and a significant risk factor for patellar instability. An MPFL reconstruction alone in the setting of a highly elevated TT-TG has a high risk of failure. A tibial tubercle osteotomy (medialization) is indicated to correct the lateralized extensor mechanism pull and normalize patellofemoral tracking.

Question 702

Topic: Knee Sports

A 22-year-old male sustains an acute knee dislocation resulting in disruption of the ACL, PCL, and the posterolateral corner (Schenck KD III-L). Which of the following physical exam findings must be carefully evaluated due to its high incidence in this specific injury pattern?

. Absent dorsalis pedis pulse

. Inability to actively extend the hallux

. Decreased sensation over the medial aspect of the foot

. Weakness in ankle plantarflexion

. Inability to invert the foot

Correct Answer & Explanation

. Inability to actively extend the hallux

Explanation

A KD III-L injury (ACL, PCL, and lateral/PLC disruption) has a high association with common peroneal nerve injury (up to 40% in posterolateral corner injuries). The common peroneal nerve innervates the anterior compartment (deep peroneal), which is responsible for ankle dorsiflexion and great toe extension via the extensor hallucis longus (EHL).

Question 703

Topic: Knee Sports

A 24-year-old male sustains an isolated posterior cruciate ligament (PCL) tibial avulsion fracture. Surgical fixation is planned via an open posteromedial approach (Burks and Schaffer). Which internervous or intermuscular interval is utilized in this specific surgical approach?

. Between the medial head of the gastrocnemius and the semimembranosus

. Between the lateral head of the gastrocnemius and the biceps femoris

. Between the popliteus and the soleus

. Between the plantaris and the lateral head of the gastrocnemius

. Between the semitendinosus and the gracilis

Correct Answer & Explanation

. Between the medial head of the gastrocnemius and the semimembranosus

Explanation

The classic posteromedial approach to the knee, as described by Burks and Schaffer, utilizes the interval between the medial head of the gastrocnemius and the semimembranosus. This provides excellent exposure to the posteromedial corner and the tibial attachment of the PCL while protecting the neurovascular bundle laterally.

Question 704

Topic: Knee Sports

During a medial patellofemoral ligament (MPFL) reconstruction for recurrent patellar instability, accurate placement of the femoral tunnel is critical to ensure proper graft isometry. According to Schottle's point, where should the optimal femoral attachment be positioned on a true lateral radiograph?

. Anterior to the posterior cortex line and distal to Blumensaat's line

. Posterior to the posterior cortex line and proximal to Blumensaat's line

. Exactly at the geometric center of the medial femoral epicondyle

. 1 mm anterior to the posterior cortex line, 2.5 mm distal to the posterior origin of the medial femoral condyle, and proximal to Blumensaat's line

. 5 mm anterior to the adductor tubercle and directly on Blumensaat's line

Correct Answer & Explanation

. Anterior to the posterior cortex line and distal to Blumensaat's line

Explanation

Schottle described a radiographic landmark for the femoral origin of the MPFL on a true lateral radiograph: 1 mm anterior to the posterior cortex extension line, 2.5 mm distal to the posterior origin of the medial femoral condyle, and proximal to the level of the posterior aspect of Blumensaat's line.

Question 705

Topic: Knee Sports

A 52-year-old male undergoes MRI of the knee after a deep squatting injury, which reveals a complete posterior medial meniscal root tear. Biomechanical studies have demonstrated that a complete tear of the medial meniscus posterior root is mechanically equivalent to which of the following conditions regarding tibiofemoral contact pressures?

. An isolated complete anterior cruciate ligament tear

. A total medial meniscectomy

. A partial medial meniscectomy preserving the peripheral rim

. A complete posterior cruciate ligament tear

. A medial collateral ligament grade III sprain

Correct Answer & Explanation

. A total medial meniscectomy

Explanation

A complete tear of the posterior root of the medial meniscus results in an inability of the meniscus to convert axial loads into hoop stresses. The meniscus essentially extrudes, leading to a profound increase in contact pressures equivalent to a total medial meniscectomy.

Question 706

Topic: Knee Sports

The posterior cruciate ligament (PCL) provides primary restraint against posterior tibial translation. It is composed of two main functional bundles. During knee range of motion, how do the tension patterns of these bundles behave?

. The anterolateral bundle is tightest in full extension, and the posteromedial bundle is tightest in deep flexion

. The anterolateral bundle is tightest in flexion, and the posteromedial bundle is tightest in extension

. Both bundles demonstrate uniform tension throughout the entire arc of motion

. Both bundles are maximally loose at 90 degrees of flexion

. Both bundles are tightest in full extension

Correct Answer & Explanation

. The anterolateral bundle is tightest in full extension, and the posteromedial bundle is tightest in deep flexion

Explanation

The PCL consists of the larger anterolateral (AL) bundle and the smaller posteromedial (PM) bundle. Biomechanically, the AL bundle is tightest in knee flexion, whereas the PM bundle is tightest in knee extension.

Question 707

Topic: Knee Sports

A 28-year-old male sustains a knee injury during a soccer match. On physical examination, the dial test reveals 15 degrees of increased external rotation on the injured side compared to the normal side when tested at 30 degrees of knee flexion. When tested at 90 degrees of knee flexion, the external rotation is symmetric between both knees. Which of the following is the most likely diagnosis?

. Isolated posterolateral corner (PLC) injury

. Isolated posterior cruciate ligament (PCL) injury

. Combined PCL and PLC injury

. Isolated anterior cruciate ligament (ACL) injury

. Posteromedial corner injury

Correct Answer & Explanation

. Isolated posterolateral corner (PLC) injury

Explanation

A positive dial test at 30 degrees of flexion with symmetry at 90 degrees of flexion indicates an isolated posterolateral corner (PLC) injury. If asymmetry is present at both 30 and 90 degrees, it indicates a combined PCL and PLC injury.

Question 708

Topic: Knee Sports

A 22-year-old female undergoes a medial patellofemoral ligament (MPFL) reconstruction for recurrent patellar instability. Postoperatively, she complains of a severe loss of knee flexion, and examination reveals a tight graft in deeper degrees of flexion. Which of the following femoral tunnel malpositions is the most likely cause of this complication?

. Placement too anterior and distal

. Placement too proximal

. Placement too deep in the trochlear groove

. Placement on the medial epicondyle

. Placement at the adductor tubercle

Correct Answer & Explanation

. Placement too proximal

Explanation

The isometric point for the MPFL femoral origin (Schöttle's point) is strictly defined. Placement of the femoral tunnel too proximal results in a graft that becomes excessively tight in knee flexion, leading to a flexion deficit and increased medial patellofemoral cartilage pressures.

Question 709

Topic: Knee Sports

A 12-year-old gymnast complains of poorly localized knee pain. Radiographs demonstrate a well-circumscribed osteochondral defect with a stable subchondral bone fragment. In juvenile osteochondritis dissecans (JOCD) of the knee, what is the most common anatomical location of the lesion?

. Central aspect of the lateral femoral condyle

. Lateral aspect of the medial femoral condyle

. Medial aspect of the lateral femoral condyle

. Anterior aspect of the medial femoral condyle

. Trochlear groove

Correct Answer & Explanation

. Lateral aspect of the medial femoral condyle

Explanation

The classic and most common location for osteochondritis dissecans (OCD) in the knee is the lateral aspect of the medial femoral condyle. Initial management for a stable lesion in a patient with open physes is typically non-operative.

Question 710

Topic: Knee Sports

A 22-year-old female presents with recurrent patellar instability. You plan a medial patellofemoral ligament (MPFL) reconstruction. Intraoperatively, fluoroscopy is used to determine the exact femoral tunnel position. According to Schöttle's criteria, which of the following radiographic landmarks best describes the correct anatomical femoral attachment of the MPFL on a true lateral radiograph?

. 1 mm anterior to the posterior cortical line, 2.5 mm distal to the posterior articular border of the medial femoral condyle, and proximal to Blumensaat's line.

. 1 mm anterior to the posterior cortical line, 2.5 mm proximal to the posterior articular border of the medial femoral condyle, and proximal to Blumensaat's line.

. 1 mm posterior to the posterior cortical line, 2.5 mm proximal to the posterior articular border of the medial femoral condyle, and distal to Blumensaat's line.

. 1 mm anterior to the posterior cortical line, 2.5 mm distal to the posterior articular border of the medial femoral condyle, and distal to Blumensaat's line.

. 1 mm posterior to the posterior cortical line, 2.5 mm distal to the posterior articular border of the medial femoral condyle, and proximal to Blumensaat's line.

Correct Answer & Explanation

. 1 mm anterior to the posterior cortical line, 2.5 mm distal to the posterior articular border of the medial femoral condyle, and proximal to Blumensaat's line.

Explanation

Schöttle's point is a reliable fluoroscopic landmark for anatomical MPFL femoral tunnel placement. It is located 1 mm anterior to the posterior cortical line extension, 2.5 mm distal to the posterior articular border of the medial femoral condyle, and proximal to the intersection of Blumensaat's line and the posterior cortical line.

Question 711

Topic: Knee Sports

A 25-year-old male presents with a posterolateral corner (PLC) knee injury. During anatomical reconstruction, the surgeon must aim to recreate the primary static stabilizers to restore normal kinematics. What are the three primary static stabilizers of the PLC?

. Popliteus tendon, popliteofibular ligament, lateral collateral ligament

. Iliotibial band, popliteus tendon, lateral collateral ligament

. Biceps femoris tendon, popliteofibular ligament, lateral collateral ligament

. Popliteus tendon, arcuate ligament, lateral collateral ligament

. Fabellofibular ligament, popliteofibular ligament, lateral collateral ligament

Correct Answer & Explanation

. Popliteus tendon, popliteofibular ligament, lateral collateral ligament

Explanation

The posterolateral corner (PLC) of the knee is a complex arrangement of structures providing restraint against varus opening, external tibial rotation, and posterior translation. The three primary static stabilizers that are most crucial for surgical reconstruction are the lateral collateral ligament (LCL), the popliteus tendon (PLT), and the popliteofibular ligament (PFL).

Question 712

Topic: Knee Sports

During an anterior cruciate ligament (ACL) reconstruction, the surgeon inadvertently places the femoral tunnel too anteriorly (i.e., too 'shallow' or high in the notch on a lateral radiograph) on the lateral femoral condyle. Which of the following kinematic complications will reliably occur as a result of this error?

. The graft will be excessively tight in flexion and loose in extension.

. The graft will be excessively tight in extension and loose in flexion.

. The graft will chronically impinge on the posterior cruciate ligament (PCL).

. The graft will impinge on the roof of the intercondylar notch in full extension.

. The graft will remain isometric and fail to undergo any length changes during range of motion.

Correct Answer & Explanation

. The graft will be excessively tight in flexion and loose in extension.

Explanation

The anatomical femoral attachment of the ACL is posterior in the notch. Placing the femoral tunnel too anteriorly (too shallow) places it eccentric to the knee's center of rotation. As the knee flexes, the distance between this anteriorly misplaced femoral origin and the tibial insertion increases. Consequently, the graft becomes pathologically tight in flexion (limiting knee flexion or stressing the graft) and loose in extension, failing to control anterior translation near full extension.

Question 713

Topic: Knee Sports

A 28-year-old male sustains a multiligamentous knee injury. On examination, a dial test is performed. There is 15 degrees of increased external rotation at 30 degrees of knee flexion compared to the contralateral side. At 90 degrees of knee flexion, the external rotation is symmetric bilaterally. What injury pattern does this indicate?

. Isolated anterior cruciate ligament (ACL) tear

. Isolated posterior cruciate ligament (PCL) tear

. Isolated posterolateral corner (PLC) injury

. Combined PCL and PLC injury

. Combined ACL and PLC injury

Correct Answer & Explanation

. Isolated anterior cruciate ligament (ACL) tear

Explanation

An increase in external rotation of >10 degrees at 30 degrees of flexion, but not at 90 degrees, is classic for an isolated posterolateral corner (PLC) injury. If external rotation is increased at both 30 and 90 degrees, it indicates a combined PCL and PLC injury.

Question 714

Topic: Knee Sports

Regarding the anatomy of the anterior cruciate ligament (ACL), which of the following statements correctly describes the biomechanical role of its two distinct bundles?

. The anteromedial (AM) bundle is tight in extension and provides rotational stability.

. The posterolateral (PL) bundle is tight in flexion and prevents anterior translation.

. The anteromedial (AM) bundle is tight in flexion and primarily controls anterior tibial translation.

. The posterolateral (PL) bundle is tight in flexion and primarily controls rotational stability.

. Both bundles are equally tight in mid-flexion and have no distinct biomechanical roles.

Correct Answer & Explanation

. The anteromedial (AM) bundle is tight in extension and provides rotational stability.

Explanation

The ACL has two main bundles: the anteromedial (AM) and posterolateral (PL) bundles. The AM bundle tightens in flexion to resist anterior tibial translation, while the PL bundle tightens in extension to resist rotatory loads.

Question 715

Topic: Knee Sports

A 12-year-old boy presents with vague knee pain and catching. Radiographs reveal an osteochondritis dissecans (OCD) lesion. What is the most common anatomical location for this lesion in the knee?

. Lateral aspect of the medial femoral condyle

. Medial aspect of the lateral femoral condyle

. Central weight-bearing dome of the medial femoral condyle

. Trochlear groove

. Inferior pole of the patella

Correct Answer & Explanation

. Lateral aspect of the medial femoral condyle

Explanation

The classic and most common location for an osteochondritis dissecans (OCD) lesion in the knee is the lateral aspect of the medial femoral condyle, accounting for roughly 70-80% of cases.

Question 716

Topic: Knee Sports

A 52-year-old female presents with acute medial knee pain after a deep squat. MRI reveals a complete posterior horn medial meniscus root tear with 4 mm of meniscal extrusion. Biomechanically, this injury is most equivalent to which of the following?

. Total meniscectomy

. Partial meniscectomy

. Anterior cruciate ligament tear

. Isolated medial collateral ligament sprain

. Medial compartment chondral defect

Correct Answer & Explanation

. Total meniscectomy

Explanation

A complete posterior horn medial meniscus root tear disrupts the hoop stresses of the meniscus. Biomechanically, this alters contact pressures to a degree equivalent to a total meniscectomy, leading to rapid chondrolysis.

Question 717

Topic: Knee Sports

A 24-year-old football player sustains a contact knee injury. On examination, the dial test demonstrates 20 degrees of increased external rotation at 30 degrees of knee flexion compared to the contralateral side, but symmetric external rotation at 90 degrees of flexion. Which structure is most likely injured?

. Isolated posterior cruciate ligament

. Isolated posterolateral corner

. Combined PCL and posterolateral corner

. Isolated anterior cruciate ligament

. Combined ACL and medial collateral ligament

Correct Answer & Explanation

. Isolated posterolateral corner

Explanation

The dial test evaluates for posterolateral corner (PLC) and PCL injuries. Increased external rotation (>10 degrees) at 30 degrees of flexion only indicates an isolated PLC injury, whereas increased rotation at both 30 and 90 degrees indicates a combined PLC and PCL injury.

Question 718

Topic: Knee Sports

A 24-year-old soccer player undergoes anterior cruciate ligament (ACL) reconstruction. Postoperatively, the patient complains of the knee 'giving way' when pivoting. Examination reveals a firm endpoint on the Lachman test but a positive pivot shift test. What is the most likely technical error made during the surgery?

. Femoral tunnel placed too anteriorly

. Femoral tunnel placed too vertically (high in the notch)

. Tibial tunnel placed too medially

. Tibial tunnel placed too anteriorly

. Inadequate graft tensioning

Correct Answer & Explanation

. Femoral tunnel placed too vertically (high in the notch)

Explanation

A vertically placed femoral tunnel in ACL reconstruction controls anterior-posterior translation (negative Lachman) but fails to adequately control rotational forces, resulting in a persistent pivot shift.

Question 719

Topic: Knee Sports

During a knee examination of a trauma patient, the dial test demonstrates 15 degrees of increased external rotation at 30 degrees of knee flexion compared to the contralateral side. However, at 90 degrees of knee flexion, the external rotation is symmetric bilaterally. Which structure is injured?

. Isolated anterior cruciate ligament (ACL)

. Isolated posterolateral corner (PLC)

. Combined posterolateral corner (PLC) and posterior cruciate ligament (PCL)

. Isolated posterior cruciate ligament (PCL)

. Medial collateral ligament (MCL) and posterior oblique ligament (POL)

Correct Answer & Explanation

. Isolated posterolateral corner (PLC)

Explanation

An asymmetric increase in external rotation at 30 degrees of flexion that corrects at 90 degrees indicates an isolated posterolateral corner (PLC) injury. If the asymmetry persists or increases at 90 degrees, a combined PLC and PCL injury is present.

Question 720

Topic: Knee Sports

A 14-year-old male presents with poorly localized knee pain and intermittent mechanical symptoms. Radiographs reveal an osteochondritis dissecans (OCD) lesion. What is the most common anatomical location for this lesion in the knee?

. Lateral aspect of the medial femoral condyle

. Medial aspect of the lateral femoral condyle

. Central weight-bearing dome of the lateral femoral condyle

. Inferior pole of the patella

. Central trochlear groove

Correct Answer & Explanation

. Lateral aspect of the medial femoral condyle

Explanation

The most common location for osteochondritis dissecans in the knee is the lateral aspect of the medial femoral condyle (often remembered by the mnemonic LAME: Lateral Aspect Medial Epicondyle/condyle).

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